640437418841 has 16 divisors (see below), whose sum is σ = 729099353088. Its totient is φ = 556853312400.

The previous prime is 640437418669. The next prime is 640437418853. The reversal of 640437418841 is 148814734046.

It is a de Polignac number, because none of the positive numbers 2^k-640437418841 is a prime.

It is a super-4 number, since 4×640437418841⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640437418841.

It is not an unprimeable number, because it can be changed into a prime (640437415841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2949110 + ... + 3158816.

It is an arithmetic number, because the mean of its divisors is an integer number (45568709568).

Almost surely, 2^640437418841 is an apocalyptic number.

It is an amenable number.

640437418841 is a deficient number, since it is larger than the sum of its proper divisors (88661934247).

640437418841 is a wasteful number, since it uses less digits than its factorization.

640437418841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221812.

The product of its (nonzero) digits is 2064384, while the sum is 50.

The spelling of 640437418841 in words is "six hundred forty billion, four hundred thirty-seven million, four hundred eighteen thousand, eight hundred forty-one".